TY - JOUR
T1 - The Microstructure Stability of Precipitation Strengthened Medium to High Entropy Superalloys
AU - Tsao, Te Kang
AU - Yeh, An Chou
AU - Murakami, Hideyuki
N1 - Funding Information:
The authors would like to thank the financial support from Ministry of Science and Technology, Taiwan (R.O.C.), Project Grant Number: 103-2221-E-214-035, 104-2221-E-214-033. The authors would also like to thank Professor J.W. Yeh for discussions on the topic of high entropy-related materials.
Publisher Copyright:
© 2017, The Minerals, Metals & Materials Society and ASM International.
PY - 2017/5/1
Y1 - 2017/5/1
N2 - Medium and high entropy superalloys based on the Ni-Co-Fe system with strengthening L12 γ′ precipitates have been developed. The present study has shown that by controlling the elemental partitioning between γ/γ′, thermal stability of γ′ can be enhanced in the high entropy γ matrix. Most importantly, high entropy superalloys exhibit stable γ–γ′ microstructures with no TCP phases after long-term exposure at elevated temperatures. Therefore, a new alloy design space for stable γ–γ′ microstructure has been presented. Furthermore, due to relatively high content of Fe and Ti, their raw materials cost and alloy density can potentially be lower than those of conventional superalloys.
AB - Medium and high entropy superalloys based on the Ni-Co-Fe system with strengthening L12 γ′ precipitates have been developed. The present study has shown that by controlling the elemental partitioning between γ/γ′, thermal stability of γ′ can be enhanced in the high entropy γ matrix. Most importantly, high entropy superalloys exhibit stable γ–γ′ microstructures with no TCP phases after long-term exposure at elevated temperatures. Therefore, a new alloy design space for stable γ–γ′ microstructure has been presented. Furthermore, due to relatively high content of Fe and Ti, their raw materials cost and alloy density can potentially be lower than those of conventional superalloys.
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U2 - 10.1007/s11661-017-4037-6
DO - 10.1007/s11661-017-4037-6
M3 - Article
AN - SCOPUS:85014661164
SN - 1073-5623
VL - 48
SP - 2435
EP - 2442
JO - Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
JF - Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
IS - 5
ER -